<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./fileinput/jQuery-2.2.0.min.js"></script>
    <style>
        tbody tr td{
            padding:5px;
            border: 1px solid #ddd;
        }
    </style>
</head>
<body>
    <button id="btn">添加</button>
    <table  cellspacing="0" >
        <thead></thead>
        <tfoot></tfoot>
        <tbody>
            <tr>
                <td></td>
                <td><input type="text" id="inp"></td>
            </tr>
        </tbody>
    </table>
    <script>
        $("#btn").click(function(){
            $("#inp").val('123').trigger('change')
        })
        $("#inp").on('change',function(){
            console.log(22222222222)
        })
    </script>
</body>
</html>